I would like to start adding solar panels in my neighborhood. Many houses around me have simple photovoltaic panels on the roof of their houses. These aren't power plants, just personal power generators.

What is the best practice to tagging solar panels on building's roofs?

I was thinking to draw the outline of the solar panels and tag it as a generator.

If you know whether these solar panels are used for producing electricity or hot water you can also either add generator:method=photovoltaic or generator:method=thermal. However as far as I know there is no real visible distinction between those two types, so better don't add this tag.